bindfs - Doesn't work for folder inside “/proc”

Question

Bindfs doesn't work for folder inside "/proc"...

[root@some_host some_folder]# bindfs --map=root/<MY_USER> "/proc/<SOME_PID>/<SOME_FOLDER>" "/home/<MY_USER>/<SOME_FOLDER>"
Failed to resolve source directory `/proc/<SOME_PID>/<SOME_FOLDER>': No such file or directory
[root@some_host some_folder]# ls "/proc/<SOME_PID>/<SOME_FOLDER>"
some_file

Why?

Thanks!

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UPDATE: Example with Docker container...

I ended up finding out that for some reason this command...

sudo bindfs --map=root/eduardo "/proc/$(docker inspect --format {{.State.Pid}} 255d)/root" "/home/eduardo/Data/Temp/20180329.1/root"

... make bindfs mount the host's file system (root directory) on the mount point and not the container's file system.

However the command...

ls "/proc/$(docker inspect --format {{.State.Pid}} 255d)/root"

... show the contents of the container's file system (root folder).

I can not see an explanation for this! It makes no sense! =|

Answer 1

I released bindfs 1.13.10 with a workaround for this.

Explanation for why it didn't work: https://github.com/mpartel/bindfs/issues/66#issuecomment-428323548